Oh - and regarding that horizontal line - that's not good. That looks like the Z stage got stuck for one layer. Is there plenty of grease on your z screw? Your printer should have come with a little green pouch of grease - meant only for the
Z screw.
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gr5 2,295
Is the left one also ABS? I wouldn't be surprised if ABS is easier on overhangs.
1) For good quality overhangs you need TONS of fan. Was the fan set to 100%? Was it blowing (not sucking)? Were both fans working?
2) You can improve quality a bit by lowering temperature and speed. The acceleration on the UM2 is probably much higher than your reprap. So printing at 100mm/sec on reprap is probably like 30mm/sec on UM2. At least for small parts. Anyway try 30mm/sec - that's a nice slow speed for when you want good visual quality. 210C is a good temp but you could always try lower. Consider printing some test overhang parts.
3) This is not the best filament for overhangs (ultimaker light blue). Consider a different color or brand but I don't recommend switching to ABS before using the printer for at least 10 different parts. Switching to ABS (and especially back again) can cause clogged nozzle or partial clogs that hinder extrusion.
4) Was the juicer on left at .1mm or .2mm layer height?
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